Auto merge of #68893 - Dylan-DPC:rollup-3f2421a, r=Dylan-DPC

Auto merge of #68893 - Dylan-DPC:rollup-3f2421a, r=Dylan-DPC

Rollup of 9 pull requests

Successful merges:

 - #68691 (Remove `RefCell` usage from `ObligationForest`.)
 - #68751 (Implement `unused_parens` for `const` and `static` items)
 - #68788 (Towards unified `fn` grammar)
 - #68837 (Make associated item collection a query)
 - #68842 (or_patterns: add regression test for #68785)
 - #68844 (use def_path_str for missing_debug_impls message)
 - #68845 (stop using BytePos for computing spans in librustc_parse/parser/mod.rs)
 - #68869 (clean up E0271 explanation)
 - #68880 (Forbid using `0` as issue number)

Failed merges:

r? @ghost